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NFC collision avoidance with controllable NFC transmission delay timing

  • US 9,723,635 B2
  • Filed: 04/26/2016
  • Issued: 08/01/2017
  • Est. Priority Date: 02/21/2014
  • Status: Active Grant
First Claim
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1. A first near field communication (NFC) circuit comprising:

  • an antenna configured to inductively couple to signals emitted by a second NFC circuit;

    a charging circuit configured to output power provided by the inductive coupling through the antenna to the signals emitted by the second NFC circuit;

    a transceiver circuit configured to be powered by the charging circuit to transmit data for receipt by the second NFC circuit; and

    a transmission delay circuit configured to be powered by the charging circuit and control the transceiver circuit to delay transmission of the data until expiration of a defined delay time after the transceiver circuit has become sufficiently powered on to operate to transmit the data;

    wherein the transmission delay circuit is configured to set the defined delay time based on determining that signals from a third NFC circuit were received by the transceiver circuit.

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